What do you do when missing screws?

You could make a list and hit R/T Specialties, PenStar Productions, Mr. G's Fasteners or any of the like companies. They have a wide assortment of fasteners packaged by assemblies and sub-assemblies to choose from. They may not have every assembly known to the Mopar world, but they can certainly help you get that you need. Most of these companies go to the bigger Mopar shows and can also be found online as well!!